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Activity: A Dynamic Proof
Go to: http://www.keypress.com/.../DynamicProof.zip (opens a new window)
Description:

Students create a sketch in which a dramatic animation shows how the sum of the areas of two squares is equal to the area of the third square. The link to the activity itself is to a zip file that contains both the activity in pdf format and a sample sketch (designed to help teachers understand how the activity should work).

This is a free sample activity from Pythagoras Plugged In: Proofs and Problems for the Geometer's Sketchpad.

Technology Type: Sketchpad 
Author: Key Curriculum Press/Dan Bennett
Language: English 
Cost: Does not require payment for use

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Activity: Pythagoras Plugged In: Proofs and Problems for the Geometer's Sketchpad
Tool: A Dynamic Proof
Courses: Math 7 Pythagorean theorem
Geometry Pythagorean theorem